Positive-pressure blower.



vNo. 888,565. PATENTED MAY 26, 1908.

J. W.`WILSON.

POSITIVBPRESSURE BLOWER.

APPLICATION HLBD AUG. ze. 1907.

[umg] y y 27 JOHN w. WILSON PATENTED MAY Z6, 1908.

J. W. WILSON.

POSITIVE PRESSURE BLOWER.

APPLICATION FILED AUG. 26. 1907.

2 SHEETS-SHEET 2 l JOHN W-WILSON PATENT OFFCE.

lTOHN W. WILSON, OF NEW YORK, N. Y.

POSITIVE-PRESSURE BLOWER.

Specification of Letters Patent.

Patented May 26, 1908.

Application filed August 26, 1907. Serial No. 390,151.

To all whom 'it may concern.'

Be it known that I, JOHN W. VILSON, a citizen of the United States, and resident of the borough of Brooklyn, county of Kings, city and State of New York.` have invented certain new and useful Improvements in Positive-Pressure Blowers, of which the following is a specification.

My invention relates to positive pressure blowers and has for its object to improve the construction thereof and to increase the efficiency of such blowers and to make them more positive in their action.

To this end my invention consists of certain constructions and combinations of parts which will be fully described hereinafter and the feature of novelty will be pointed out in the appended claims.

Reference is to be had to the accompanying drawing in which Figure 1 is a side elevation of my improved blower showing the casing in section; Fig. 2 is a central sectional view with the blast wheel partly in elevation and partly in section Fig. 3 is a detailed section in the line 3-3 of Fig. l; Fig.' 4 is a detail of one of the blades or vanes; Fig. 5 is a sectional view of another form of blade on the line 5 5 of Fig. 7 Fig. 6 is a detailedview of the blade bearing; Fig. 7 is an edge view of said blade; and Fig. 8 is a. sectional view thereof on the line 8-8 of Fig. 5.

A is the casing which is provided with inclined side plates A and A2 each having a journal box A3 and each secured in position by means of screws or bolts A4. The casing is further provided with ports B-B which act as air inlets yand outlets respectively, according to the direction in which the blower is operated.

O is a blast wheel to which is secured at its central portion at each sidea ball D adapted to rotate in a corresponding socket in each of the journal boXes A3. A cylindrical collar D is secured to each of the balls D andis provided with a central opening arranged to receive the end of the shaft E or E/ which rotate in the bearings F secured to each of the journal boxes A3. Packing or Babbitt metal may be introduced around each of said shafts as at E2. The shafts E and E are secured in position in the balls D in any suitable manner as for instance by means of pins E3 which pass through the collars D and through the shafts E and E. A pulley G may be secured on one of said shafts E or E to rotate therewith and to act as a driving medium.

The balls D are each provided with slots D2 in which the blades H are pivoted as at H. These pivots extend transversely of the slots D2 so that the blades are capable of swinging in planes at substantiallyright angles to the plane of rotation of the blast wheel and are further so arranged that the planes in which the two blades swing intersect each other. In other words, the blades swing on their pivots at right angles to each other as clearly shown in Fi 2. The blast wheel is hollow and is provi ed with slots or openings C in which the blades move. The one edge of each of these blades is adapted to engage the inner faces of each of the plates A and A2 and is concaved as shown at H2 in Fig. r4. These concaved edges H2 of the blades H are arranged to receive the members l which are conveX to fit said concaved edges H2 and are secured to or form part of bearing rings 1. rlhese bearing rings 1 travel in recesses A5 in each of the side plates and are provided with an inclined eriphery the purpose of which will be more c early described hereinafter. The blast wheel Chas a running fit with the casing around its entire periphery, the portsB and B being bridged as side for the air to enter or leave the casing as shown in Fig. 3. By having the blast wheel engage the casing throughout its entire circumference the danger of dirt or grease working its way in between said wheel and the casing is entirely obviated. Any dirt or o"rease which may enter either of the ports will with my arrangement work its way to the air space in the casing and will be blown out at the opposite port, thus always maintaining the device clean and in operative condition. By 'having the balls D, a perfect fit is secured in the ournals A3 and the danger of leakage at these points is practically overcome. This construction also reduces the wear and friction of the rings l when they-engage these balls D as the outer surfaces of the balls correspond to the line of travel of the same rings as they swing to dierent angles during the rotation of the blast wheel.

n operation power is applied to the pulley G and the blast wheel thus caused to rotate in one direction or the other. This will cause indicated at B2 so as to leave spaces at' eachthe blades H to be swung on their pivots H through the medium of the inclined side plates A and A2 and will suck air through one of the ports B or B into the space J of the casing and will expel said air through the opposite port. A continuous action is secured by having the blades arranged at right angles to each other. The operation of my device as to blowing is practically the same as that of the construction shown in my Patent #497108 ofA May 9, 1893, and need not be further described here. By making the working edge of each of the blades concave to iit the convex surface of the members I ofthe bearing ring, an air tight fit is secured at these points, which device still leaves the blades free to operate in the best manner. A much larger blade bearing is also secured by having the members I extend to the outer edge of the blades resulting also in greater durability than if the blades engage only the bearing as heretofore.

It is to be understood that while I have shown the edges of the blade concaved to engage the convex surface of the members I the reverse construction might be used. That is the members I might be concaved and the edges of the blades might be convexed. If desired the bearing ring I may be secured to the ball D but this is not absolutely necessary as the members I will serve to lock the blades and the bearing ring together to rotate in unison. By making the periphery of the said bearing rings inclined, the side plates A and A2 are easily removed from said ring and are just as easily re laced thus making said parts easily separab e.

In Figs. 5, 7 and 8, I have shown what might be termed a built up blade instead of thesolid blade heretofore described and used. This blade comprises two plates h and h se- .cured to a central bearing member i by riv ets or otherwise. Filling strips j extend lengthwise of the blades between the plates 7L and h to which said strips are suitably secured by rivets or screws j. Bearing or packing strips k are fastened to the filling strips by means of screws 7c the heads of which are counter sunk in said bearing strips. These bearing strips compose the working edges of the blades and are concaved for the same purpose as described with regard to the blade I-I hereinbefore mentioned. Filling Ipieces l extend along the lateral edges of the lades and are secured in position between the plates by means of rivets or screws Z. m are spacing washers held between the plates 7i and h by .means of screws or bolts m. Vith this construction I secure a light and serviceable blade which is easy to manufacture and is durable.

By having the bearing or packing stri s 7c removable new strips may be substitutec for strips which have become worn thus always insuring a perfect it between the working edges of the blades and the casing without necessitating the substitution of an entire new blade.

Various modifications may be made without departing from the nature of my invention as definedin the claims.

I claim l. The combination of the shaft, the casing having a portion inclined with reference to said shaft, the blast wheel secured to the shaft and provided with a guide-way in an axial plane, the blade mounted t0 swing in said guideway and pivoted to the shaft on an axis perpendicular to that of the shaft, said blade being adapted to fit the inclined portion of the casing and having concaved edges adjacent to said portion, and the bearing ring rotatably seated in the casing and having convex extensions fitted into said grooved edges of the blade.

2. rIhe combination of the shaft having a ball at its inner end, the casing provided with a socket for said ball and with a portion inclined with reference to said shaft, the blast wheel secured to the shaft and provided with a guideway in an axial plane, and the blade mounted to swing in said guideway and pivoted to the ball portion of the shaft on an axis perpendicular to that of the shaft, said blade being adapted. to fit the inclined portion of the casing.

3. The combination of the shaft, the casing having a portion inclined with reference to said shaft, the blast wheel secured to the shaft and provided with a guide way and pivoted to the shaft on an axis perpendicular to that of the shaft, said blade being adapted 'to fit the inclined portion of the casing, and the bearing ring rotatably seated in the casing and having extensions from opposite edges thereof upon which the outer edges of said blade are fitted, substantially as set forth.

4. The combination of the shaft, the casing having a portion inclined with reference to said shaft, the blast wheel secured to the shaft and provided with a guide way in an axial plane, the blade mounted to swing in said guideway and pivoted to the shaft on an axis perpendicular to that of the shaft, said blade being adapted to fit the inclined portion of the casing, and the bearing ring rotatably seated in the casing and having bar extensions extending along the face and beyond opposite edges thereof and upon which the outer edges of said blade are fitted.

In witness whereof, I have hereunto set my hand in the presence of two witnesses this 15th day of August, in the year one thousand nine hundred and seven. l

JOHN W. WILSON.

Witnesses Jol-IN LoTxA, R. ABERTY. 

